/*
 *  Copyright (c) 2015 The WebRTC project authors. All Rights Reserved.
 *
 *  Use of this source code is governed by a BSD-style license
 *  that can be found in the LICENSE file in the root of the source
 *  tree. An additional intellectual property rights grant can be found
 *  in the file PATENTS.  All contributing project authors may
 *  be found in the AUTHORS file in the root of the source tree.
 */

#include "webrtc/video/payload_router.h"

#include "webrtc/base/checks.h"
#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp.h"
#include "webrtc/modules/rtp_rtcp/include/rtp_rtcp_defines.h"

namespace webrtc {

PayloadRouter::PayloadRouter(const std::vector<RtpRtcp*>& rtp_modules)
    : active_(false), num_sending_modules_(1), rtp_modules_(rtp_modules) {
  UpdateModuleSendingState();
}

PayloadRouter::~PayloadRouter() {}

size_t PayloadRouter::DefaultMaxPayloadLength() {
  const size_t kIpUdpSrtpLength = 44;
  return IP_PACKET_SIZE - kIpUdpSrtpLength;
}

void PayloadRouter::set_active(bool active) {
  rtc::CritScope lock(&crit_);
  if (active_ == active)
    return;
  active_ = active;
  UpdateModuleSendingState();
}

bool PayloadRouter::active() {
  rtc::CritScope lock(&crit_);
  return active_ && !rtp_modules_.empty();
}

void PayloadRouter::SetSendingRtpModules(size_t num_sending_modules) {
  RTC_DCHECK_LE(num_sending_modules, rtp_modules_.size());
  rtc::CritScope lock(&crit_);
  num_sending_modules_ = num_sending_modules;
  UpdateModuleSendingState();
}

void PayloadRouter::UpdateModuleSendingState() {
  for (size_t i = 0; i < num_sending_modules_; ++i) {
    rtp_modules_[i]->SetSendingStatus(active_);
    rtp_modules_[i]->SetSendingMediaStatus(active_);
  }
  // Disable inactive modules.
  for (size_t i = num_sending_modules_; i < rtp_modules_.size(); ++i) {
    rtp_modules_[i]->SetSendingStatus(false);
    rtp_modules_[i]->SetSendingMediaStatus(false);
  }
}

bool PayloadRouter::RoutePayload(FrameType frame_type,
                                 int8_t payload_type,
                                 uint32_t time_stamp,
                                 int64_t capture_time_ms,
                                 const uint8_t* payload_data,
                                 size_t payload_length,
                                 const RTPFragmentationHeader* fragmentation,
                                 const RTPVideoHeader* rtp_video_hdr) {
  rtc::CritScope lock(&crit_);
  RTC_DCHECK(!rtp_modules_.empty());
  if (!active_ || num_sending_modules_ == 0)
    return false;

  int stream_idx = 0;
  if (rtp_video_hdr) {
    RTC_DCHECK_LT(rtp_video_hdr->simulcastIdx, rtp_modules_.size());
    // The simulcast index might actually be larger than the number of modules
    // in case the encoder was processing a frame during a codec reconfig.
    if (rtp_video_hdr->simulcastIdx >= num_sending_modules_)
      return false;
    stream_idx = rtp_video_hdr->simulcastIdx;
  }
  return rtp_modules_[stream_idx]->SendOutgoingData(
      frame_type, payload_type, time_stamp, capture_time_ms, payload_data,
      payload_length, fragmentation, rtp_video_hdr) == 0 ? true : false;
}

void PayloadRouter::SetTargetSendBitrates(
    const std::vector<uint32_t>& stream_bitrates) {
  rtc::CritScope lock(&crit_);
  RTC_DCHECK_LE(stream_bitrates.size(), rtp_modules_.size());
  for (size_t i = 0; i < stream_bitrates.size(); ++i) {
    rtp_modules_[i]->SetTargetSendBitrate(stream_bitrates[i]);
  }
}

size_t PayloadRouter::MaxPayloadLength() const {
  size_t min_payload_length = DefaultMaxPayloadLength();
  rtc::CritScope lock(&crit_);
  for (size_t i = 0; i < num_sending_modules_; ++i) {
    size_t module_payload_length = rtp_modules_[i]->MaxDataPayloadLength();
    if (module_payload_length < min_payload_length)
      min_payload_length = module_payload_length;
  }
  return min_payload_length;
}

}  // namespace webrtc
